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Related to conium maculatum: Cicuta maculata
Poison Hemlock and Water Hemlock- one of the most poisonous plants, grows in moist areas near water, streams, ditches, swamps. White flower clusters in umbrella shape. Stems are smooth (no hair) and have purple splotches, sometimes covered with a white powder that rubs off easily. The leaves are sometimes mistaken for parsley. Smells bad and can grow up to 10 feet high.